I have a Razer Lachesis 5600 mouse and its indeed very nice and sexy piece of hardware, i absolutely love it. However, i have to admit, i had some technical issues with it, more exactly with the left and occasionally right button too, they would doubleclick, when pressed just once. This was pretty annoying while playing Call of Duty for example. Had to blow some air under the buttons to temporarily fix it, everytime it happened...strangely though, the issue kinda went away recently for whatever reason. So i am fairly happy.